Running Water Bridge
(see note below picture)
Unidentified man and a solder on bridge over Running Water in Whiteside Valley Tennessee, built by U.S. Army Engineers - from National Archives
Photo submitted by Bridgeport Railroad Depot Museum - Bridgeport Alabama
The image is not a Running Water (Whiteside), but is of the carriage way under the railroad trestle bridge across the Tennessee River at Bridgeport, Alabama..... If you will look at one of the images of the Whiteside bridge during the Civil War you will see that it was a bean pole bridge with no opening underneath the tracks for a passageway.
EFG